Mask



FIG. 1 is a perspective view of my new design for a mask as worn by a wearer;

FIG. 2 is a front side perspective view thereof;

FIG. 3 is rear perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a first side view thereof;

FIG. 7 is an opposite side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The broken lines shown in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

CLAIM I claim the ornamental design for a mask, as shown and described. 